high CVSS 7.8

CVE-2026-54656·Python vulnerability

datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON, YAML, or CSV. From 0.52.1 until 0.60.2, datamodel-code-generator interpolates validators from --extra-template-data in src/datamodel_code_generator/model/pydantic_v2/base_model.py through _process_validators into @field_validator decorators without safe validation, allowing Python code execution when the generated Pydantic v2 model is imported. This issue is fixed in version 0.60.2.

Severity
high
Software
Python
Fixed in
0.60.2
Published
2026-07-28

Affected versions

From: 0.52.1

Until: 0.60.2

Fixed in: 0.60.2

How to fix this CVE

Update datamodel-code-generator to version 0.60.2 or later to patch unsafe validator interpolation in Pydantic v2 model generation. If you use datamodel-code-generator with untrusted --extra-template-data inputs or auto-import generated models, apply this patch immediately. Verify the update by checking the installed version and regenerating any models from potentially compromised schemas.

sudo dnf update python3-datamodel-code-generator || pip3 install --upgrade datamodel-code-generator>=0.60.2

Defensia detects this vulnerability

How to check if you are affected

  1. Run `pip3 show datamodel-code-generator | grep Version` to check the installed version; versions 0.52.1 through 0.60.1 are vulnerable
  2. Search your project for generated Pydantic v2 models that were created with --extra-template-data flags: `grep -r '@field_validator' . --include='*.py' | head -20`
  3. Check if any generated model files contain suspicious field_validator decorators with inline code: `grep -rn 'field_validator' . --include='*.py' -A 3 | grep -E '(exec|eval|__import__|subprocess)'`
  4. Verify the patch by running `pip3 install datamodel-code-generator==0.60.2` and then `pip3 show datamodel-code-generator | grep Version` to confirm version 0.60.2 or later is installed

FAQ

What is CVE-2026-54656?

CVE-2026-54656 is a code injection vulnerability in datamodel-code-generator versions 0.52.1–0.60.1 where unsanitized validator code from --extra-template-data is directly embedded into Pydantic v2 @field_validator decorators, enabling arbitrary Python code execution when the generated models are imported.

Is CVE-2026-54656 being actively exploited?

No, CVE-2026-54656 is not listed on the CISA Known Exploited Vulnerabilities (KEV) catalog and no public exploits are currently available. However, the vulnerability requires prompt patching as exploitation is trivial once a malicious schema is supplied.

What versions of datamodel-code-generator are affected by CVE-2026-54656?

Versions 0.52.1 through 0.60.1 are affected. Version 0.60.2 and later contain the security fix.

How do I check if my server is vulnerable to CVE-2026-54656?

Run `pip3 show datamodel-code-generator` and verify the Version field is 0.60.2 or later. If the version is between 0.52.1 and 0.60.1 inclusive, your installation is vulnerable.

Does Defensia detect CVE-2026-54656?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If datamodel-code-generator is installed on a monitored server, CVE-2026-54656 will appear in your dashboard with remediation steps.

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References

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